I purchased this playpen, and I'm telling you it was the best $50 I ever spent. You can arrange it in so many positions (around the cage, attached to the cage, or just simply blocking off a portion of the room you are in.
http://www.ferret.com/item/marshall-pet-ferret-small-pet-deluxe-play-pen/650889/
I keep my chins in my office and I just place this in front of the areas I don't want them in (in front of my desk, computer and bookshelf) so they can pretty much come and go in and out of the cage as they please during playtime. (I never leave them out unattended). So far they have not tried to jump over it. I used to use cardboard to block these areas and it was such a pain in the behind - plus they would end up chewing holes through it and get back behind my computer anyway. With this new playpen that no longer happens.
http://www.ferret.com/item/marshall-pet-ferret-small-pet-deluxe-play-pen/650889/
I keep my chins in my office and I just place this in front of the areas I don't want them in (in front of my desk, computer and bookshelf) so they can pretty much come and go in and out of the cage as they please during playtime. (I never leave them out unattended). So far they have not tried to jump over it. I used to use cardboard to block these areas and it was such a pain in the behind - plus they would end up chewing holes through it and get back behind my computer anyway. With this new playpen that no longer happens.